All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
What we know about zombie games is that they include things like resurrecting the dead to life through magic and sorcery, and it happens in a scary manner. The ruling we adopt here in Islamweb (the Arabic page) is that playing this game is prohibited because it involves different prohibited matters.
Allah knows best.